How best to park your satellite antennas

Hi all,
I cannot remember this question being discussed before!
If you have a nice array of VHF and UHF antennas - 2 stacked X 8 foot long yagis one ach band plus a 2 foot S band dish, is it best from wind loading and other reasons to park it:
vertically pointing straight up (the dish has a hole at the bottom)
pointing to the horizon towards the prevailing wind
somewhere else?
I know that at SSTL in Guildford they are usually parked pointing straight up but I have never been able to find anyone with a really good explanation for doing so.
If you look at 193.51.07.114 you can see the sort of array that I am talking about!
Many thanks
Graham
G3VZV
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